Let’s define mAh, watts, Wh, and voltage.
mAh (milliamp hours) represents the amount of stored energy in a battery.
The higher the mAh rating, the longer the battery will last.
Many of our batteries have higher mAh ratings than original brand batteries.
A higher mAh battery is fully compatible with your laptop and will provide longer runtime
between charges.
Watts measure the amount of energy a device uses.
This rating applies to any device that draws power from a battery.
Wh (Watt-hours) is the amount of power used over the course of one hour.
Voltage measures the electrical pressure delivered to your laptop.
Laptop manufacturers often use batteries with different voltage ratings.
As long as the battery is designed for your model, voltage differences do not create
compatibility issues.
Most laptop chargers are rated at 19 volts. This allows the charger to power the laptop
and charge the battery at the same time. If the voltage were lower, the charger would only
be able to run the laptop.
Battery Cell Voltage Reference
| Cells |
Cell Voltage |
Formula |
Nominal Voltage |
| 1 cell |
3.6V / 3.7V |
1 × 3.6V / 3.7V |
3.6V / 3.7V |
| 2 cells |
3.6V / 3.7V |
2 × 3.6V / 3.7V |
7.2V / 7.4V |
| 3 cells |
3.6V / 3.7V |
3 × 3.6V / 3.7V |
10.8V / 11.1V |
| 4 cells |
3.6V / 3.7V |
4 × 3.6V / 3.7V |
14.4V / 14.8V |
